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LEASE RENTAL REVENUES AND AIRCRAFT AND ENGINES HELD FOR LEASE - Components of Aircraft and engines held for operating leases, net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
LEASE RENTAL REVENUES AND AIRCRAFT AND ENGINES HELD FOR LEASE
Aircraft and engines held for operating leases	$ 210,593		$ 210,593		$ 228,942
Less accumulated depreciation	(135,694)		(135,694)		(142,098)
Aircraft and engines held for operating lease	74,899		74,899		$ 86,844
Depreciation	2,200	$ 5,400	4,600	$ 12,500
Supplemental rents recognized as revenue	$ 1,800	$ 2,100	$ 2,900	$ 7,600
Term of lease	3 years		3 years

X

- Definition

Amount of accumulated depreciation and amortization from property, plant, and equipment underlying asset under operating lease.

+ References

No definition available.

+ Details

Name:	asle_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentUnderlyingAssetUnderOperatingLease
Namespace Prefix:	asle_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

" The amount of expense recognized in the current period that reflects the allocation of the cost of property, plant, and equipment underlying asset under operating lease, over the assets' useful lives."

+ References

No definition available.

+ Details

Name:	asle_DepreciationPropertyPlantAndEquipmentUnderlyingAssetUnderOperatingLease
Namespace Prefix:	asle_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, before accumulated depreciation and amortization, of property, plant, and equipment underlying asset under operating lease.

+ References

No definition available.

+ Details

Name:	asle_PropertyPlantAndEquipmentUnderlyingAssetUnderOperatingLeaseBeforeAccumulatedDepreciationDepletionAndAmortization
Namespace Prefix:	asle_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesOperatingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981

+ Details

Name:	us-gaap_LessorOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of contingent rental revenue recognized for the period under lease, based on the occurrences of an event or condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121578510&loc=d3e41551-112718

+ Details

Name:	us-gaap_OperatingLeasesIncomeStatementContingentRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration